/*
 * The MIT License (MIT)
 *
 * Copyright (c) Despector <https://despector.voxelgenesis.com>
 * Copyright (c) contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package org.spongepowered.despector.emitter.bytecode.statement;

import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
import org.spongepowered.despector.ast.generic.ClassTypeSignature;
import org.spongepowered.despector.ast.generic.TypeSignature;
import org.spongepowered.despector.ast.insn.Instruction;
import org.spongepowered.despector.ast.stmt.misc.Return;
import org.spongepowered.despector.emitter.StatementEmitter;
import org.spongepowered.despector.emitter.bytecode.BytecodeEmitterContext;

public class BytecodeReturnEmitter implements StatementEmitter<BytecodeEmitterContext, Return> {

    @Override
    public void emit(BytecodeEmitterContext ctx, Return stmt, boolean semicolon) {
        MethodVisitor mv = ctx.getMethodVisitor();
        if (!stmt.getValue().isPresent()) {
            mv.visitInsn(Opcodes.RETURN);
        } else {
            ctx.updateStack(-1);
            Instruction insn = stmt.getValue().get();
            ctx.emitInstruction(insn, ctx.getMethod().getReturnType());
            TypeSignature ret = ctx.getMethod().getReturnType();
            if (ret == ClassTypeSignature.INT || ret == ClassTypeSignature.BOOLEAN || ret == ClassTypeSignature.BYTE
                    || ret == ClassTypeSignature.SHORT || ret == ClassTypeSignature.CHAR) {
                mv.visitInsn(Opcodes.IRETURN);
            } else if (ret == ClassTypeSignature.LONG) {
                mv.visitInsn(Opcodes.LRETURN);
            } else if (ret == ClassTypeSignature.FLOAT) {
                mv.visitInsn(Opcodes.FRETURN);
            } else if (ret == ClassTypeSignature.DOUBLE) {
                mv.visitInsn(Opcodes.DRETURN);
            } else {
                mv.visitInsn(Opcodes.ARETURN);
            }
        }
    }

}
